Offline vaults and multiple PCs

I have some users using both a laptop and a desktop PC, and their windows profile is roaming between both PCs.On their desktop PC I want to desactivate the EnterpriseVault offline mode and hide the 'offline vaults options' menu.And on their laptop I want to let the user chose to activate or not the EnterpriseVault offline mode.

I know that I can disable/enable the offline mode using the regkey "EVenable". But how can I hide the 'Kvault offline options' menu (on the desktop only)?Any idea?